???? ????? ??????? PN16: ?????? ????? ?????? ?? ??????? ???????

????? ??????? PN16 ?? ???? ???? ?? ????? ????????? ????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ???? ???? ?????? ??? ????????? ???????. ?? ????? ????? ??????? PN16 ?????? ??? ?????? ????? ?????? ??? ???? ???????? ??????? ???????? ??????????. ??? ?????? ????????? ?? ?????? ?????? ?????? ????? ??????? ?????? ??? ???? ???? ????? ????? ??????? ???????. ?? ??????? ???????? ???? ????? ??????? ?????? ????? ??????? ?????? ??? ????? ??? ??????? ?????? ???? ???? ????. ???? ???? ??????? ?????? ???? ?????? ?? ???????? ??? ?????? ???? ?????? ?? ??? ??????? ???????? ???????? ????????. ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd.? ??? ??????? ?????? ?????? ?????? ?????? ?????? ???????? ???????. ????? ??????? PN16 ?????? ??? ???? ????????? ??? ???? ????? ????? ?????????? ???????? ???? ???????? ????? ??. ???? ??? ????? ?????? ?????? ?? ????? ??????? PN16 ???? ?????? ?? ???? ???????